Rotary compressor



Jan. 3, 1933 E. me]

ROTARY COMPRESSOR Filed Nov. 14. 1931 Fateuted Jan 3,, 1933 Em meet, orwmrnrt'rnn'rt, SWITZERLAND, ASSIGNOR T0 FIR-M S'ULZER FB'ERES soorE'trEANONYME, or WINTERTHUR, SWITZERLAND ao'reiw corar-ansson Applicationfiled; November 14-, 1931, Serial "No. 574,977, and. in SwitzerlandNovember 17, 1930.

This invention relates to rotary compressors and has as its object toprovide an ar rangementfor reducing the temperature of the compressedfluid delivered and simultaneously increasing the capacity of themachine.

According to the invention the suction, compression and deliverychambers of the compressorare connected to an injector device in such amanner thatworking fluid from the delivery chamber combines in theinjector device with working fluid from the suction chamber and theresultant working fluid at an intermediate pressure is cooled and is introduced into the compression chamber so as to reduce to a desired valuethe temperature of the compressed working fluid delivered by thecompressor.

If desired, the working fluid withdrawn from the delivery chamber of thecompressor may be passed through a cooler prior to being supplied to theinjector device so as to increase still further the cooling action ofthe intermediate pressure fluid introduced into the compression chamber.

One construction according to the invention will now be described, byway of example, with reference to the accompanying drawing, the singlefigure of which shows a sectional side elevation of the compressor.

As shown in the figure a multi-bladed rotary compressor has a rotor acarrying outwardly sliding vane-type blades 7) arranged in a casing 0.When the compressor is operating the working fluid passes in thedirection indicated by the arrows from the suction chamber d through thecrescent-shaped compression chamber 6 to the delivery chamber Aninjector device 72 is provided with a pressure fluid inlet h which isconnected through a cooling coil g, a pipe 9 and a regulating valve 0 tothe delivery chamber f of the compressor. A suction inlet is in theinjector device at is connected by the pipe 2' and regulating valve 12to the suction chamber (1 of the compressor whilst the deliverydischarge outlet m of the injector device n is connected through acooling coil and pipe Z-to a point in the compression chamber 6 at anintermediate pressure.

When the compressor is operating, high pressure fluid from the chamber fis blown through the pressure fluid inlet h and draws low pressure fluidfrom the suction chamber (Z which low pressure fluid, mixing with thehigh pressure fluid in the suction inlet is, produces a resultantworkingfluid at an intermediate pressure which passes through the cooling coilZ and into the compression chamher 6. This cooled working fluidintroduced into the compression chamber tends to cool the fluid which isalready in that chamber and which is heated by the partial compressionto which it has already been subjected. It will be apparent that areduction will thus be effected in the final temperature of thecompressed fluid delivered into the chamber f.

The quantity of the working fluid introduced through the injector 71into the compression chamber can be regulated by means of the valves pand 0 in such a manner that the final temperature of the compressedfluid can be reduced to a desired value, additional regulation of thistemperature being obtained, if necessary, by adjusting the temperai tureof the cooling medium circulating round the coils Z and g. If desiredthe cooling coil 9 may be omitted but it this is done a somewhat smallertemperature reduction is ob tained.

it will be appreciated that the quantity of fluid delivered by thecompressor is increased by reason of the additional fluid drawn from thesuction chamber by the injector and admitted into the compressionchamber through the pipe Z.

It is to be understood that the above description is by way ofexample'only and that modifications may be made within the scope of theinvention.

it claim:

1. In a rotary compressor, in combination a rotor carrying outwardlysliding vane-type blades, a casing for said rotor provided with acrescent-shaped compression chamber, a suction chamber and a deliverychamber, an injector device having a pressure-fluid inlet, a suctioninlet and a delivery discharge outlet, a pipe connecting said deliverychamber to said pressure fluid inlet, a second pipe con- 100 nectingsaid suction inlet to said suction chamber, a third pipe connecting saiddelivery discharge outlet to an intermediate point of saidcrescent-shaped compression chamber and a cooling coil inserted in saidthird pipe connection.

2. In a rotary compressor, in combination a rotor carrying outwardlysliding vane-type blades, a casing for said rotor provided with acrescent-shaped compression chamber, a suction chamber and a deliverychamber, an injector device having a pressure-fluid-inlet, a suctioninlet and a delivery discharge outlet, a pipe connecting said deliverychamber to said pressure fluid inlet, a cooling coil arranged in saidpipe, a second pipe connecting said suct on inlet to said suctionchamber, a third pipe connecting said delivery discharge outlet to anintermediate point of said cresf cent-shaped compression chamber and acool-t ing coil inserted in said third pipe connection.

3. In a rotary compressor, in combination a rotor carrying outwardlysliding vane-type blades, a casing for said rotor provided with acrescent-shaped compression chamber, asuct on chamber and a deliverychamber, an injector device having a pressure-fluid inlet, a suctioninlet and a delivery discharge outlet, a pipe connecting said deliverychamber to said pressure fluid inlet, a regulating valve in said pipe, acooling coil arranged in said pipe, a second pipe connecting saidsuction inlet to said suction chamber, a regulating valve in said secondpipe, a third pipe connecting said delivery discharge outlet to anintermediate point of said crescent-shaped compression chamber and acooling coil insorted in said third pipe connection.

In testimony whereof I aflix my signature.

EMIL KAGI.

